CVE-2022-4666Public exploitNetwork attack vector

Stored XSS via unescaped breadcrumb shortcode attribute

Published Feb 21, 2023 · Updated Mar 12, 2025

Stored XSS in Markup (JSON-LD) structured in schema.org through 4.8.1 allows remote authenticated users to execute scripts via shortcodes. The breadcrumb shortcode returns its class attribute to page HTML without validation or escaping; a crafted quote and event handler persist JavaScript. Contributor-level permission is required, a parent page must be selected for the breadcrumb to render, and a user must open the page to trigger the script.

CVSS severity5.4
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Markup (JSON-LD) structured in schema.org through 4.8.1 allows remote authenticated users to execute scripts via shortcodes. The breadcrumb shortcode returns its class attribute to page HTML without validation or escaping; a crafted quote and event handler persist JavaScript. Contributor-level permission is required, a parent page must be selected for the breadcrumb to render, and a user must open the page to trigger the script.

The record

CVE
CVE-2022-4666
Published
Feb 21, 2023
Updated
Mar 12, 2025
Vendor
Terakoya
Product
Markup (JSON-LD) structured in schema.org
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Terakoya · Markup (JSON-LD) structured in schema.orgversion=0 <=4.8.1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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